Fog in Wellington created mayhem for Christmas travellers today, with 32 flights in and out of the city cancelled and flights in other parts of the country affected.

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All but two of the Wellington flights affected were Air New Zealand services.

Flights have since resumed.

The fog and cloud, caused by warm northerly air mixing with damper air, settled over much of Wellington this morning.

Air New Zealand confirmed 40 flights in or out of the capital were cancelled as a result. They included flights to Hamilton, Gisborne, Rotorua, Nelson, Blenheim, Taupo, Dunedin, and Timaru.

Jan Peek was scheduled to fly out of Wellington with her family at 8am and was meant to be in Queenstown by afternoon picking up tickets to walk the Routeburn Track, which they were due to start tomorrow.

Instead they have spent the day afternoon at Wellington Airport after their plane was ''delayed and delayed then cancelled''.

The family managed to finally get an afternoon flight to Dunedin and were facing a long bus ride to Queenstown last night.

''I don't think we can complain. They can't help the weather,'' she said.

Kendra Cocksedge, who was returning home to New Plymouth for Christmas, was also philosophical about the delay.

''You can't really do much about it. There's probably people who have to get home for more important things.''

Her flight to New Plymouth was cancelled, but she was offered one to Whanganui instead and was trying to arrange family members to pick her up.

Rowena Coleman turned up for her flight to Christchurch for Christmas with children Emma, 11, and Liam 9, at 11.45am and had to wait for one at 6.45pm instead. ''There's not a lot you can do about it - Wellington weather.''

MetService forecaster Ian Gall said there was no significant wind on the way to ''flush'' away the low cloud, meaning it was expected to stick around until tomorrow morning.